Abstract
To study the influence of inlet guide vanes (IGVs) on the pressure pulsation of a shaft tubular pump, this paper first conducts an experiment to study IGVs. Then, numerical calculations of the shaft tubular pump with and without IGVs are performed to analyze the hydraulic performance and pressure fluctuation characteristics. Finally, the reliability and accuracy of the data are verified by a model test. Numerical simulation results show that with additional IGVs, the pressure pulsation amplitude at the impeller inlet first decreases and then increases under small-flow and design conditions but gradually increases under large-flow conditions. When the IGVs are added to the impeller inlet of the shaft tubular pump, the hydraulic loss in front of the impeller inlet increases, resulting in a significant drop in the head and efficiency of the pump device when the flow rate is less than 1.12 Qd; when the flow rate is greater than 1.12Qd, the head and efficiency of the pump device do not change significantly. IGVs can improve the condition of impeller water inflow and reduce pressure fluctuation on the blade surface.
Highlights
A shaft tubular pump is a kind of axial flow pump
The influence of the number of inlet guide vanes (IGVs) on the performance and pressure fluctuation of the shaft tubular pump was experimentally studied. en, numerical simulations of the shaft tubular pump with and without IGVs were performed by CFD. e influence of the IGVs on the hydraulic performance and pressure fluctuation characteristics of the shaft tubular pump was studied
Based on the analysis of the pressure fluctuation at the impeller inlet, the following conclusions were obtained: (1) e number of IGVs has a great impact on the performance of the shaft tubular pump
Summary
A shaft tubular pump is a kind of axial flow pump. In China, shaft tubular pumps are widely used in large-flow and lowhead pump stations. e shaft tubular pump has the advantages of straight flow passage, smooth internal flow, and small hydraulic loss [1,2,3,4,5]. 3D IGVs had a better reduction effect on the main frequency of pressure pulsation than 2D IGVs. Shi et al [18] studied the effect of the angle difference of impeller blades on the performance of an axial flow pump. Shock and Vibration found that IGVs with a 0° angle had little effect on the hydraulic characteristics of the pumps in high-efficiency areas and low-flow conditions. Yang et al [31] studied the influence of the impeller inlet baffle on its performance. The influence of the number of IGVs on the performance and pressure pulsation of the shaft tubular pump is studied through model tests. E purpose of this article is to derive the change law of the pressure pulsation of the shaft tubular pump [39,40,41] and provide guidance for the structural design and operation of pump stations We mainly analyze the influence of the number of IGVs and the addition of IGVs on the performance and pressure pulsation characteristics of the pump unit. e purpose of this article is to derive the change law of the pressure pulsation of the shaft tubular pump [39,40,41] and provide guidance for the structural design and operation of pump stations
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